Abstract
Rest tremor is generally regarded as the characteristic tremor which is associated with Parkinson’s disease (PD). However, some patients with PD also experience a postural tremor which may be unilateral or bilateral and may be more severe and disabling than their rest tremor. If other signs of PD are not yet present, a misdiagnosis of essential tremor (ET) is often made. The postural tremor of ET occurs immediately after the upper limbs are raised to a horizontal position, while the postural tremor of PD occurs after a latency of about 5 s and has the same frequency as the patient’s rest tremor.
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